US4072665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide from arylene diamine, isophthalic acid and alkylene dicarboxylic acid
Assignee: Dow Chemical Co
•
Filing: 1976-03-08
•
Granted: 1978-02-07
•
Expires: 1996-03-08
Abstract
Abstract Novel copolyamides having the recurring unit ##STR1## are disclosed wherein R, in 60 percent to 85 percent of the recurring units, is --CH 2 -- x wherein x is an integer from 7 to 12 inclusive, and, in 15 percent to 40 percent of the recurring units, R is m-phenylene; and Ar is an arylene radical. The copolyamides are characterized by ease of melt processing such as in molding, extruding, and injection molding, while at the same time possessing good high temperature stability, and being further characterized by unexpectedly high impact and flexural strengths.
Inventors
- 👤 Besir K. Onder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:34
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
51 words
A fiber forming copolyamide consisting essentially of the recurring unit ##STR25## wherein R in 60 to 85 percent of the recurring units is ##STR26## wherein x represents an integer from 7 to 12 inclusive and in 15 to 40 percent of the recurring units R is m-phenylene, and Ar is 4,4'-methylenediphenylene.
Claim 2
Dependent Claim
51 words
A fiber forming copolyamide consisting essentially of the recurring unit ##STR25## wherein R in 60 to 85 percent of the recurring units is ##STR26## wherein x represents an integer from 7 to 12 inclusive and in 15 to 40 percent of the recurring units R is m-phenylene, and Ar is 4,4'-methylenediphenylene.
Claim 3
Dependent Claim
12 words
A copolyamide according to claim 1 wherein x is equal to 7.
Claim 4
Dependent Claim
51 words
A fiber forming copolyamide consisting essentially of the recurring unit ##STR27## wherein R in about 65 to 75 percent of the recurring units is --CH 2 ) x wherein x represents an integer from 7 to 12 inclusive and in 25 to 35 percent of the recurring units R is m-phenylene.
Claim 5
Dependent Claim
51 words
A fiber forming copolyamide consisting essentially of the recurring unit ##STR27## wherein R in about 65 to 75 percent of the recurring units is --CH 2 ) x wherein x represents an integer from 7 to 12 inclusive and in 25 to 35 percent of the recurring units R is m-phenylene.
Claim 6
Dependent Claim
26 words
A copolyamide according to claim 3 wherein R is ##STR28## is about 70 percent of the recurring units and in the remaining 30 percent is m-phenylene.
Claim 7
Dependent Claim
12 words
A copolyamide according to claim 3 wherein x is equal to 7.
Claim 8
Dependent Claim
29 words
A fiber forming copolyamide consisting essentially of the recurring unit ##STR29## wherein R in about 70% of the recurring units is ##STR30## and in the remaining 30% is m-phenylene.
Claim 9
Dependent Claim
29 words
A fiber forming copolyamide consisting essentially of the recurring unit ##STR29## wherein R in about 70% of the recurring units is ##STR30## and in the remaining 30% is m-phenylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |